Kids’ Bike Size Chart & Calculator

child measuring height next to a kids bike

Selecting the right kids’ bike size is the crucial step to ensuring your child’s safety and comfort while riding their bike.

If you’re worried about getting it wrong, our kids’ bike size chart and calculator on this page will simplify the process, guiding you to the best fit for your little rider.

Let’s make every ride memorable and safe!

How to Measure Bike Size for a Kid?

what size kids bike

Bike sizes for kids work slightly differently compared to adult sizes. Kids’ bikes are typically sized based on the bike’s wheel size and the rider’s age, though height and inseam help to further narrow down the selection.

So, before consulting our bike size chart for kids below, start by measuring your child’s inseam. Have them stand flat-footed with legs slightly apart and measure the distance from the ground to their crotch.

Now you’re ready for the next step!

1. Kids’ Bike Size Chart

The best and easiest way to discover correct kids’ bike sizes is by comparing your child’s height and/or leg inseam against a kids’ bike size chart, like the one we’ve created below. Then, simply choose the bike with the right wheel size for optimal comfort and safety.

Age Height (Inch) Height (cm) Leg Inseam (Inch) Leg Inseam (cm) Wheel Size
2 2’9″ – 3’1″ 85-90 cm 12″ – 14″ 85 – 90 cm 10″
3-4 3’1″ – 3’3″ 90-100 cm 14″ – 17″ 35 – 42 cm 12″
4-5 3’3″ – 3’7″ 100-110 cm 16″ – 20″ 40 – 50 cm 14″
5-6 3’7″ – 3’8″ 110-115 cm 18″ – 22″ 45 – 50 cm 16″
6-8 3’8″ – 4’0″ 115-120 cm 20″ – 24″ 50 – 60 cm 18″
7-9 4’0″ – 4’5″ 120-135 cm 22″ – 25″ 55 – 63 cm 20″
9-11 4’5″ – 4’9″ 135-145 cm 24″ – 28″ 60 – 72 cm 24″
11-14 5’+ 145 cm + 28″+ 72 cm+ 26″


2. Kids’ Bike Size Calculator

Using the calculator below is a simple and fast way to narrow down your selection of the perfect kids’ bike sizes. It’s a great starting point, as all you need is to enter your kids’ age (2 – 14 years), and the calculator will return the recommended wheel size.

The page is printable, so you can print it out and take it with you for reference when shopping.

Give it a try!


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Frequently Asked Questions

kids bike size chart faq

1. How do I size my child for a bike?

Kids' bike sizes are based on wheel size, so to size your child for a bike, you should first measure their leg inseam and then find the right wheel size in a kids' bike size chart. If you don't know your child's inseam length, you can also get the right size based on their age, although this method is not as precise. 

2. Is a 16 or 20-inch bike for a 4-year-old?

Neither a 16-inch nor a 20-inch bike is the right fit for a 4-year-old, as both are too big. Instead, 4-year-olds should ride a kids' bike with 14" wheels, but a 12" kids' bike could be the right fit as well, depending on the child's height and leg length. 

3. What size bike is for a 7-year-old?

The best size for a 7-year-old is a kids' bike with 18" or 20" wheels, depending on how tall they are and what their leg length is. Keep in mind that this information is just a starting point as every child is different, so it's best to measure their leg inseam and narrow down the selection based on that. 

4. What age is a 24-inch bike for?

A 24-inch bike is best for kids aged 9-11, though kids slightly younger and older than that could fit as well, depending on their height and inseam length. Sometimes, even short teens aged around 14 years can ride a kids' bike with 24-inch wheels. 

5. Can a 7-year-old ride a 26-inch bike?

No, a 26-inch bike would be too big for most 7-year-olds to ride comfortably and safely. Instead, 7-year-olds should ride a bike with 18" or 20" wheels, depending on their height and inseam length. 


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